<template>
	<view>
		<search @click="gotoSearch"></search>
		<view class="scroll-view-container">
			<!-- 左侧的滚动视图区域 -->
			<scroll-view scroll-y="true" class="left-scroll-view" :style="{ height: wh + 'px' }">
				<block v-for="(item, i) in cateList" :key="i">
					<view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">
						{{ item.cat_name }}
					</view>
				</block>
			</scroll-view>
			<!-- 左侧的滚动视图区域 -->
			<scroll-view scroll-y="true" class="right-scroll-view" :style="{ height: wh + 'px' }" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
					<view class="cate-lv2-title">{{ item2.cat_name }}</view>

					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<image :src="item3.cat_icon" mode=""></image>
							<text>{{ item3.cat_name }}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
import badgeMix from '@/mixins/tabbar-badge.js';
export default {
	mixins: [badgeMix],
	data() {
		return {
			wh: 0,
			scrollTop: 0,
			cateList: [],
			active: 0,
			cateLevel2: []
		};
	},
	onLoad() {
		const sysInfo = uni.getSkylineInfoSync();
		this.wh = sysInfo.windowHeight;

		//调用获取数据的方法
		this.getCateList();
	},
	methods: {
		async getCateList() {
			const { data: res } = await uni.$http.get('/api/public/v1/categories');
			if (res.meta.status !== 200) return uni.$showMsg();

			this.cateList = res.message;
			this.cateLevel2 = this.cateList[0].children;
		},
		activeChanged(i) {
			this.active = i;
			this.cateLevel2 = this.cateList[i].children;

			this.scrollTop = this.scrollTop ? 1 : 0;
		},
		gotoGoodsList(item3) {
			uni.navigateTo({
				url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
			});
		},
		gotoSearch() {
			uni.navigateTo({
				url: '/subpkg/search/search'
			});
		}
	}
};
</script>

<style lang="scss">
.scroll-view-container {
	display: flex;

	.left-scroll-view {
		width: 120px;

		.left-scroll-view-item {
			line-height: 60px;
			background-color: #f7f7f7;
			text-align: center;
			font-size: 12px;

			&.active {
				background-color: #ffffff;
				position: relative;

				&::before {
					content: '';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #c00000;
					position: absolute;
					left: 0;
					top: 50%;
					transform: translateY(-50%);
				}
			}
		}
	}

	.right-scroll-view {
		.cate-lv2 {
			.cate-lv2-title {
				font-size: 12px;
				font-weight: bold;
				text-align: center;
				padding: 15px 0;
			}
			.cate-lv3-list {
				display: flex;
				flex-wrap: wrap;
				.cate-lv3-item {
					width: 33.33%;
					margin-bottom: 10px;
					display: flex;
					flex-direction: column;
					align-items: center;
					image {
						width: 60px;
						height: 60px;
					}
					text {
						font-size: 12px;
					}
				}
			}
		}
	}
}
</style>
